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  • 1.
    Brule, Emile
    et al.
    KTH, Superseded Departments, Chemistry.
    Pei, Yuxin
    KTH, Superseded Departments, Chemistry.
    Lake, Fredrik
    KTH, Superseded Departments, Chemistry.
    Rahm, Fredrik
    KTH, Superseded Departments, Chemistry.
    Moberg, Christina
    KTH, Superseded Departments, Chemistry.
    Chelating phosphines with C-2 and C-3 symmetry2004In: Mendeleev communications (Print), ISSN 0959-9436, E-ISSN 1364-551X, no 6, p. 276-277Article in journal (Refereed)
    Abstract [en]

    Antide formation between ring opened aziridines and 2-(diphenylphosphino)benzoic acid provides an easy access to chelating di- and triphosphines with C-2 and C-3 symmetry.

  • 2. Gonzalez, Nelida J. D.
    et al.
    Borg-Karlson, Anna-Karin
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Pettersson Redeby, Johan
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Analytical Chemistry.
    Noziere, Barbara
    Krejci, Radovan
    Pei, Yuxin
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Dommen, Josef
    Prevot, Andre S. H.
    New method for resolving the enantiomeric composition of 2-methyltetrols in atmospheric organic aerosols2011In: Journal of Chromatography A, ISSN 0021-9673, E-ISSN 1873-3778, Vol. 1218, no 51, p. 9288-9294Article in journal (Refereed)
    Abstract [en]

    In order to facilitate the determination of the primary and secondary origin of atmospheric organic aerosols, a novel method involving chiral capillary gas chromatography coupled with mass spectrometry has been developed and validated. The method was focused on the analysis of 2-methylerythritol and 2-methylthreitol, considered to be tracers of secondary organic aerosols from the oxidation of atmospheric isoprene. The method was validated by performing various tests using authentic standards, including pure enantiomeric standards. The result showed that the analytical method itself does not affect the enantiomeric composition of the samples analyzed. The method was applied on atmospheric aerosols from a boreal forest collected in Aspvreten, Sweden and on laboratory samples obtained from liquid phase oxidation of isoprene and smog chamber experiments. Aerosol samples contained one enantiomer of 2-methylerythritol in significantly larger quantities than the others. In contrast, the liquid-phase oxidation of isoprene and its gas-phase oxidation in the smog chamber produced all enantiomers in equal quantities. The results obtained where the enantiomer fraction, EF, is larger than 0.50 suggest that 2-methyltetrols in atmospheric aerosols may also have biological origin. Information about the differences between enantiomer fractions obtained using this method brings new insights in the area of atmospheric aerosols.

  • 3. Grutters, Michiel M. P.
    et al.
    van der Vlugt, Jarl Ivar
    Pei, Yuxin
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Mills, Allison M.
    Lutz, Martin
    Spek, Anthony L.
    Muller, Christian
    Moberg, Christina
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Vogt, Dieter
    Highly Selective Cobalt-Catalyzed Hydrovinylation of Styrene2009In: Advanced Synthesis and Catalysis, ISSN 1615-4150, E-ISSN 1615-4169, Vol. 351, no 13, p. 2199-2208Article in journal (Refereed)
    Abstract [en]

    Phosphine complexes of cobalt halide salts activated by diethylaluminum chloride are shown to yield highly active catalysts in the hydrovinylation of styrene, with unprecedented high selectivity to the desired product 3-phenyl-1-butene (3P1B). Double-bond isomerization, a common problem in codimerization reactions, only occurs after full conversion with these catalyst systems, even at elevated temperature. The most active catalysts are based on cobalt halide species combined with either C-1- or C-2-bridged diphosphines, heterodonor P,N or P,O ligands, flexible bidentate phosphine ligands or monodentate phosphine ligands. Kinetic investigations show an order > 1 in catalyst, which indicates either the involvement of dinuclear species in the catalytic cycle or partial catalyst decomposition via a bimolecular pathway.

  • 4. Noziere, Barbara
    et al.
    Gonzalez, Nelida J. D.
    Borg-Karlson, Anna-Karin
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Pei, Yuxin
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Pettersson Redeby, Johan
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Analytical Chemistry.
    Krejci, Radovan
    Dommen, Josef
    Prevot, Andre S. H.
    Anthonsen, Thorleif
    Atmospheric chemistry in stereo: A new look at secondary organic aerosols from isoprene2011In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 38, p. L11807-Article in journal (Refereed)
    Abstract [en]

    Isoprene, a compound emitted by vegetation, could be a major contributor to secondary organic aerosols (SOA) in the atmosphere. The main evidence for this contribution were the 2-methylbutane-1,2,3,4-tetraols, or 2-methyltetrols (2-methylerythritol and 2-methylthreitol) present in ambient aerosols. In this work, the four stereoisomers of these tetraols were analyzed in aerosols from Aspvreten, Sweden. 2-C-methyl-D-erythritol was found in excess over its enantiomer in the Spring/Summer, by up to 29% in July. This clearly indicated some biological origins for this enantiomer, consistent with its well-documented production by plants and other living organisms. In addition, a minimum of 20 to 60% of the mass of racemic tetraols appeared from biological origin. Thus, the SOA mass produced by isoprene in the atmosphere is less than what indicated by the 2-methyltetrols in aerosols. Our results also demonstrate that stereochemical speciation can distinguish primary and secondary organic material in atmospheric aerosols.

  • 5.
    Pei, Yuxin
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Brulé, Emilie
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Moberg, Christina
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    New multidendate phosphine ligands and their application in palladium-catalyzed asymmetric allylic alkylation2005In: ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY: Volume 230, 2005, p. U3420-U3421Conference paper (Other academic)
  • 6.
    Pei, Yuxin
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Yu, Hui
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Pei, Zhichao
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Theurer, Matthias
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Ammer, Carolin
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    André, Sabine
    Gabius, Hans-Joachim
    Yan, Mingdi
    KTH, School of Chemical Science and Engineering (CHE), Chemistry.
    Ramström, Olof
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Photoderivatized polymer thin films at quartz crystal microbalance surfaces: Sensors for carbohydrate-protein interactions2007In: Analytical Chemistry, ISSN 0003-2700, E-ISSN 1520-6882, Vol. 79, no 18, p. 6897-6902Article in journal (Refereed)
    Abstract [en]

    Photoderivatized polymer-coated gold surfaces have been developed following a perfluorophenylazide-based double ligation strategy. Gold-plated quartz crystal microbalance (QCM) crystals were initially covalently functionalized with a monolayer of poly(ethylene glycol) (PEG), using photo-or thermolytic nitrene formation and insertion. The polymer surfaces were subsequently used as substrates for photoinsertion of carbohydrate-derivatized photoprobes, yielding different recognition motifs for selective protein binding. The resulting robust and biocompatible sensor surfaces were applied to a flow-through QCM instrument for monitoring lectin-carbohydrate interactions in real time. The results clearly show the predicted lectin selectivity, demonstrating the applicability of the approach.

  • 7.
    Pei, Zhichao
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry.
    Pei, Yuxin
    KTH, School of Chemical Science and Engineering (CHE), Chemistry.
    Yu, Hui
    KTH, School of Chemical Science and Engineering (CHE), Chemistry.
    Theurer, Matthias
    KTH, School of Chemical Science and Engineering (CHE), Chemistry.
    André, Sabine
    Gabius, Hans-Joachim
    Yan, Mingdi
    Ramström, Olof
    KTH, School of Chemical Science and Engineering (CHE), Chemistry.
    Photoderivatized QCM Surfaces for the Study of Real-Time Lectin-Carbohydrate InteractionsArticle in journal (Refereed)
1 - 7 of 7
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